French Horns

Single Horns

Double Horns

Triple Horns

Descant Horns

Natural Horns

Wagner Tuben

Available as specialty solo instruments or student models

Most common orchestral horn in use today

Combines a double horn with a third key in high Eb or F alto

High range solo double horn in Bb and high F alto

Historic instrument with full set of crooks and no valves

A rare instrument combining elements of the French horn and the tuba.  Wiki page